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newlib-cygwin/winsup/utils/strace.cc

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/* strace.cc
Copyright 2000, 2001, 2002 Red Hat Inc.
Written by Chris Faylor <cgf@redhat.com>
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#define cygwin_internal cygwin_internal_dontuse
#include <stdio.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>
#include <signal.h>
#include <errno.h>
#include "cygwin/include/sys/strace.h"
#include "cygwin/include/sys/cygwin.h"
#undef cygwin_internal
/* GCC runtime library's C++ EH code unfortunately pulls in stdio, and we
get undefine references to __impure_ptr, and hence the following
hack. It should be reasonably safe however as long as this file
is built using -mno-cygwin as is intended. */
int _impure_ptr;
/* we *know* we're being built with GCC */
#define alloca __builtin_alloca
// Version string.
static const char *version_string = "@(#)strace V1.0, Copyright (C) 2001, 2002 Red Hat Inc., " __DATE__ "\n";
static const char *pgm;
static int forkdebug = 0;
static int numerror = 1;
static int usecs = 1;
static int delta = 1;
static int hhmmss = 0;
static int bufsize = 0;
static int new_window = 0;
static long flush_period = 0;
static BOOL close_handle (HANDLE h, DWORD ok);
#define CloseHandle(h) close_handle(h, 0)
struct child_list
{
DWORD id;
HANDLE hproc;
int saw_stars;
char nfields;
long long start_time;
DWORD last_usecs;
struct child_list *next;
child_list ():id (0), hproc (NULL), saw_stars (0), nfields (0),
start_time (0), last_usecs (0), next (NULL)
{
}
};
child_list children;
static void
warn (int geterrno, const char *fmt, ...)
{
va_list args;
char buf[4096];
va_start (args, fmt);
sprintf (buf, "%s: ", pgm);
vsprintf (strchr (buf, '\0'), fmt, args);
if (geterrno)
perror (buf);
else
{
fputs (buf, stderr);
fputs ("\n", stderr);
}
}
static void __attribute__ ((noreturn))
error (int geterrno, const char *fmt, ...)
{
va_list args;
char buf[4096];
va_start (args, fmt);
sprintf (buf, "%s: ", pgm);
vsprintf (strchr (buf, '\0'), fmt, args);
if (geterrno)
perror (buf);
else
{
fputs (buf, stderr);
fputs ("\n", stderr);
}
ExitProcess (1);
}
DWORD lastid = 0;
HANDLE lasth;
#define PROCFLAGS \
PROCESS_ALL_ACCESS /*(PROCESS_DUP_HANDLE | PROCESS_TERMINATE | PROCESS_VM_READ | PROCESS_VM_WRITE) */
static void
add_child (DWORD id, HANDLE hproc)
{
child_list *c = children.next;
children.next = (child_list *) calloc (1, sizeof (child_list));
children.next->next = c;
lastid = children.next->id = id;
lasth = children.next->hproc = hproc;
}
static child_list *
get_child (DWORD id)
{
child_list *c;
for (c = &children; (c = c->next) != NULL;)
if (c->id == id)
return c;
error (0, "no process id %d found", id);
}
static void
remove_child (DWORD id)
{
child_list *c;
if (id == lastid)
lastid = 0;
for (c = &children; c->next != NULL; c = c->next)
if (c->next->id == id)
{
child_list *c1 = c->next;
c->next = c1->next;
free (c1);
return;
}
error (0, "no process id %d found", id);
}
#define LINE_BUF_CHUNK 128
class linebuf
{
size_t alloc;
public:
size_t ix;
char *buf;
linebuf ()
{
ix = 0;
alloc = 0;
buf = NULL;
}
~linebuf ()
{
if (buf)
free (buf);
}
void add (const char *what, int len);
void add (const char *what)
{
add (what, strlen (what));
}
void prepend (const char *what, int len);
};
void
linebuf::add (const char *what, int len)
{
size_t newix;
if ((newix = ix + len) >= alloc)
{
alloc += LINE_BUF_CHUNK + len;
buf = (char *) realloc (buf, alloc + 1);
}
memcpy (buf + ix, what, len);
ix = newix;
buf[ix] = '\0';
}
void
linebuf::prepend (const char *what, int len)
{
int buflen;
size_t newix;
if ((newix = ix + len) >= alloc)
{
alloc += LINE_BUF_CHUNK + len;
buf = (char *) realloc (buf, alloc + 1);
buf[ix] = '\0';
}
if ((buflen = strlen (buf)))
memmove (buf + len, buf, buflen + 1);
else
buf[newix] = '\0';
memcpy (buf, what, len);
ix = newix;
}
static void
make_command_line (linebuf & one_line, char **argv)
{
for (; *argv; argv++)
{
char *p = NULL;
const char *a = *argv;
int len = strlen (a);
if (len != 0 && !(p = strpbrk (a, " \t\n\r\"")))
one_line.add (a, len);
else
{
one_line.add ("\"", 1);
for (; p; a = p, p = strchr (p, '"'))
{
one_line.add (a, ++p - a);
if (p[-1] == '"')
one_line.add ("\"", 1);
}
if (*a)
one_line.add (a);
one_line.add ("\"", 1);
}
one_line.add (" ", 1);
}
if (one_line.ix)
one_line.buf[one_line.ix - 1] = '\0';
else
one_line.add ("", 1);
}
static DWORD child_pid;
static BOOL WINAPI
ctrl_c (DWORD)
{
static int tic = 1;
if ((tic ^= 1) && !GenerateConsoleCtrlEvent (CTRL_C_EVENT, 0))
error (0, "couldn't send CTRL-C to child, win32 error %d\n",
GetLastError ());
return TRUE;
}
DWORD (*cygwin_internal) (int, ...);
static int
load_cygwin ()
{
static HMODULE h;
if (cygwin_internal)
return 1;
if (h)
return 0;
if (!(h = LoadLibrary ("cygwin1.dll")))
{
errno = ENOENT;
return 0;
}
if (!(cygwin_internal = (DWORD (*) (int, ...)) GetProcAddress (h, "cygwin_internal")))
{
errno = ENOSYS;
return 0;
}
return 1;
}
static void
attach_process (pid_t pid)
{
load_cygwin ();
child_pid = (DWORD) cygwin_internal (CW_CYGWIN_PID_TO_WINPID, pid);
if (!child_pid)
error (0, "no such pid - %d", pid);
if (!DebugActiveProcess (child_pid))
error (0, "couldn't attach to pid %d<%d> for debugging", pid, child_pid);
printf ("Attached to pid %d (windows pid %u)\n", pid, (unsigned) child_pid);
return;
}
static void
create_child (char **argv)
{
linebuf one_line;
STARTUPINFO si;
PROCESS_INFORMATION pi;
BOOL ret;
DWORD flags;
if (!*argv)
error (0, "no program argument specified");
memset (&si, 0, sizeof (si));
si.cb = sizeof (si);
/* cygwin32_conv_to_win32_path (exec_file, real_path); */
flags = forkdebug ? 0 : DEBUG_ONLY_THIS_PROCESS;
flags |= CREATE_DEFAULT_ERROR_MODE | DEBUG_PROCESS;
flags |= (new_window ? CREATE_NEW_CONSOLE | CREATE_NEW_PROCESS_GROUP : 0);
make_command_line (one_line, argv);
SetConsoleCtrlHandler (NULL, 0);
ret = CreateProcess (0, one_line.buf, /* command line */
NULL, /* Security */
NULL, /* thread */
TRUE, /* inherit handles */
flags, /* start flags */
NULL, NULL, /* current directory */
&si, &pi);
if (!ret)
error (0, "error creating process %s, (error %d)", *argv,
GetLastError ());
CloseHandle (pi.hThread);
CloseHandle (pi.hProcess);
child_pid = pi.dwProcessId;
SetConsoleCtrlHandler (ctrl_c, 1);
}
static int
output_winerror (FILE *ofile, char *s)
{
char *winerr = strstr (s, "Win32 error ");
if (!winerr)
return 0;
DWORD errnum = atoi (winerr + sizeof ("Win32 error ") - 1);
if (!errnum)
return 0;
/*
* NOTE: Currently there is no policy for how long the
* the buffers are, and looks like 256 is a smallest one
* (dlfcn.cc). Other than error 1395 (length 213) and
* error 1015 (length 249), the rest are all under 188
* characters, and so I'll use 189 as the buffer length.
* For those longer error messages, FormatMessage will
* return FALSE, and we'll get the old behaviour such as
* ``Win32 error 1395'' etc.
*/
char buf[4096];
if (!FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
errnum,
MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) buf, sizeof (buf), NULL))
return 0;
/* Get rid the trailing CR/NL pair. */
char *p = strchr (buf, '\0');
p[-2] = '\n';
p[-1] = '\0';
*winerr = '\0';
fputs (s, ofile);
fputs (buf, ofile);
return 1;
}
static SYSTEMTIME *
syst (long long t)
{
FILETIME n;
static SYSTEMTIME st;
long long now = t + ((long long) usecs * 10);
n.dwHighDateTime = now >> 32;
n.dwLowDateTime = now & 0xffffffff;
FileTimeToSystemTime (&n, &st);
return &st;
}
static void __stdcall
handle_output_debug_string (DWORD id, LPVOID p, unsigned mask, FILE *ofile)
{
int len;
int special;
char alen[3 + 8 + 1];
DWORD nbytes;
child_list *child = get_child (id);
HANDLE hchild = child->hproc;
#define INTROLEN (sizeof (alen) - 1)
if (id == lastid && hchild != lasth)
warn (0, "%p != %p", hchild, lasth);
alen[INTROLEN] = '\0';
if (!ReadProcessMemory (hchild, p, alen, INTROLEN, &nbytes))
#ifndef DEBUGGING
return;
#else
error (0,
"couldn't get message length from subprocess %d<%p>, windows error %d",
id, hchild, GetLastError ());
#endif
if (strncmp (alen, "cYg", 3))
return;
len = (int) strtoul (alen + 3, NULL, 16);
if (!len)
return;
if (len > 0)
special = 0;
else
{
special = len;
if (special == _STRACE_INTERFACE_ACTIVATE_ADDR)
len = 17;
}
char *buf;
buf = (char *) alloca (len + 65) + 10;
if (!ReadProcessMemory (hchild, ((char *) p) + INTROLEN, buf, len, &nbytes))
error (0, "couldn't get message from subprocess, windows error %d",
GetLastError ());
buf[len] = '\0';
char *s = strtok (buf, " ");
unsigned n = strtoul (s, NULL, 16);
s = strchr (s, '\0') + 1;
if (special == _STRACE_INTERFACE_ACTIVATE_ADDR)
{
DWORD new_flag = 1;
if (!WriteProcessMemory (hchild, (LPVOID) n, &new_flag,
sizeof (new_flag), &nbytes))
error (0,
"couldn't write strace flag to subprocess, windows error %d",
GetLastError ());
return;
}
char *origs = s;
if (mask & n)
/* got it */ ;
else if (!(mask & _STRACE_ALL) || (n & _STRACE_NOTALL))
return; /* This should not be included in "all" output */
DWORD dusecs, usecs;
char *ptusec, *ptrest;
dusecs = strtoul (s, &ptusec, 10);
char *q = ptusec;
while (*q == ' ')
q++;
if (*q != '[')
{
usecs = strtoul (q, &ptrest, 10);
while (*ptrest == ' ')
ptrest++;
}
else
{
ptrest = q;
ptusec = s;
usecs = dusecs;
}
if (child->saw_stars == 0)
{
FILETIME st;
char *news;
GetSystemTimeAsFileTime (&st);
FileTimeToLocalFileTime (&st, &st);
child->start_time = st.dwHighDateTime;
child->start_time <<= 32;
child->start_time |= st.dwLowDateTime;
if (*(news = ptrest) != '[')
child->saw_stars = 2;
else
{
child->saw_stars++;
while ((news = strchr (news, ' ')) != NULL && *++news != '*')
child->nfields++;
if (news == NULL)
child->saw_stars++;
else
{
s = news;
child->nfields++;
}
}
}
else if (child->saw_stars < 2)
{
int i;
char *news;
if (*(news = ptrest) != '[')
child->saw_stars = 2;
else
{
for (i = 0; i < child->nfields; i++)
if ((news = strchr (news, ' ')) == NULL)
break; // Should never happen
else
news++;
if (news == NULL)
child->saw_stars = 2;
else
{
s = news;
if (*s == '*')
{
SYSTEMTIME *st = syst (child->start_time);
fprintf (ofile,
"Date/Time: %d-%02d-%02d %02d:%02d:%02d\n",
st->wYear, st->wMonth, st->wDay, st->wHour,
st->wMinute, st->wSecond);
child->saw_stars++;
}
}
}
}
long long d = usecs - child->last_usecs;
char intbuf[40];
if (child->saw_stars < 2 || s != origs)
/* Nothing */ ;
else if (hhmmss)
{
s = ptrest - 9;
SYSTEMTIME *st = syst (child->start_time + (long long) usecs * 10);
sprintf (s, "%02d:%02d:%02d", st->wHour, st->wMinute, st->wSecond);
*strchr (s, '\0') = ' ';
}
else if (!delta)
s = ptusec;
else
{
s = ptusec;
sprintf (intbuf, "%5d ", (int) d);
int len = strlen (intbuf);
memcpy ((s -= len), intbuf, len);
}
child->last_usecs = usecs;
if (numerror || !output_winerror (ofile, s))
fputs (s, ofile);
if (!bufsize)
fflush (ofile);
}
static void
proc_child (unsigned mask, FILE *ofile, pid_t pid)
{
DEBUG_EVENT ev;
int processes = 0;
time_t cur_time, last_time;
SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_HIGHEST);
last_time = time (NULL);
while (1)
{
BOOL debug_event = WaitForDebugEvent (&ev, 1000);
DWORD status = DBG_CONTINUE;
if (bufsize && flush_period > 0 &&
(cur_time = time (NULL)) >= last_time + flush_period)
{
last_time = cur_time;
fflush (ofile);
}
if (!debug_event)
continue;
if (pid)
{
(void) cygwin_internal (CW_STRACE_TOGGLE, pid);
pid = 0;
}
switch (ev.dwDebugEventCode)
{
case CREATE_PROCESS_DEBUG_EVENT:
if (ev.u.CreateProcessInfo.hFile)
CloseHandle (ev.u.CreateProcessInfo.hFile);
add_child (ev.dwProcessId, ev.u.CreateProcessInfo.hProcess);
processes++;
break;
case CREATE_THREAD_DEBUG_EVENT:
break;
case LOAD_DLL_DEBUG_EVENT:
if (ev.u.LoadDll.hFile)
CloseHandle (ev.u.LoadDll.hFile);
break;
case OUTPUT_DEBUG_STRING_EVENT:
handle_output_debug_string (ev.dwProcessId,
ev.u.DebugString.lpDebugStringData,
mask, ofile);
break;
case EXIT_PROCESS_DEBUG_EVENT:
remove_child (ev.dwProcessId);
break;
case EXCEPTION_DEBUG_EVENT:
if (ev.u.Exception.ExceptionRecord.ExceptionCode !=
STATUS_BREAKPOINT)
{
status = DBG_EXCEPTION_NOT_HANDLED;
#if 0
fprintf (stderr, "exception %p at %p\n",
ev.u.Exception.ExceptionRecord.ExceptionCode,
ev.u.Exception.ExceptionRecord.ExceptionAddress);
#endif
}
break;
}
if (!ContinueDebugEvent (ev.dwProcessId, ev.dwThreadId, status))
error (0, "couldn't continue debug event, windows error %d",
GetLastError ());
if (ev.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT && --processes == 0)
break;
}
}
static void
dostrace (unsigned mask, FILE *ofile, pid_t pid, char **argv)
{
if (*argv && pid)
error (0, "can't use -p with program argument");
if (!pid)
create_child (argv);
else
attach_process (pid);
proc_child (mask, ofile, pid);
return;
}
typedef struct tag_mask_mnemonic
{
unsigned long val;
const char *text;
}
mask_mnemonic;
static const mask_mnemonic mnemonic_table[] = {
{_STRACE_ALL, "all"},
{_STRACE_FLUSH, "flush"},
{_STRACE_INHERIT, "inherit"},
{_STRACE_UHOH, "uhoh"},
{_STRACE_SYSCALL, "syscall"},
{_STRACE_STARTUP, "startup"},
{_STRACE_DEBUG, "debug"},
{_STRACE_PARANOID, "paranoid"},
{_STRACE_TERMIOS, "termios"},
{_STRACE_SELECT, "select"},
{_STRACE_WM, "wm"},
{_STRACE_SIGP, "sigp"},
{_STRACE_MINIMAL, "minimal"},
{_STRACE_EXITDUMP, "exitdump"},
{_STRACE_SYSTEM, "system"},
{_STRACE_NOMUTEX, "nomutex"},
{_STRACE_MALLOC, "malloc"},
{_STRACE_THREAD, "thread"},
{0, NULL}
};
static unsigned long
mnemonic2ul (const char *nptr, char **endptr)
{
// Look up mnemonic in table, return value.
// *endptr = ptr to char that breaks match.
const mask_mnemonic *mnp = mnemonic_table;
while (mnp->text != NULL)
{
if (strcmp (mnp->text, nptr) == 0)
{
// Found a match.
if (endptr != NULL)
{
*endptr = ((char *) nptr) + strlen (mnp->text);
}
return mnp->val;
}
mnp++;
}
// Didn't find it.
if (endptr != NULL)
{
*endptr = (char *) nptr;
}
return 0;
}
static unsigned long
parse_mask (const char *ms, char **endptr)
{
const char *p = ms;
char *newp;
unsigned long retval = 0, thisval;
const size_t bufsize = 16;
char buffer[bufsize];
size_t len;
while (*p != '\0')
{
// First extract the term, terminate it, and lowercase it.
strncpy (buffer, p, bufsize);
buffer[bufsize - 1] = '\0';
len = strcspn (buffer, "+,\0");
buffer[len] = '\0';
strlwr (buffer);
// Check if this is a mnemonic. We have to do this first or strtoul()
// will false-trigger on anything starting with "a" through "f".
thisval = mnemonic2ul (buffer, &newp);
if (buffer == newp)
{
// This term isn't mnemonic, check if it's hex.
thisval = strtoul (buffer, &newp, 16);
if (newp != buffer + len)
{
// Not hex either, syntax error.
*endptr = (char *) p;
return 0;
}
}
p += len;
retval += thisval;
// Handle operators
if (*p == '\0')
break;
if ((*p == '+') || (*p == ','))
{
// For now these both equate to addition/ORing. Until we get
// fancy and add things like "all-<something>", all we need do is
// continue the looping.
p++;
continue;
}
else
{
// Syntax error
*endptr = (char *) p;
return 0;
}
}
*endptr = (char *) p;
return retval;
}
static void
usage ()
{
fprintf (stderr, "\
Usage: strace [OPTIONS] <command-line>\n\
-b, --buffer-size=SIZE set size of output file buffer\n\
-d, --no-delta don't display the delta-t microsecond timestamp\n\
-f, --trace-children also trace forked child processes\n\
-h, --help display this help info\n\
-m, --mask=MASK set message filter mask\n\
-o, --output=FILENAME set output file to FILENAME\n\
-p, --pid=n attach to executing program with cygwin pid n\n\
-n, --crack-error-numbers output descriptive text instead of error\n\
numbers for Windows errors\n\
-S, --flush-period=PERIOD flush buffered strace output every PERIOD secs\n\
-t, --timestamp use an absolute hh:mm:ss timestamp insted of the\n\
default microsecond timestamp. Implies -d\n\
-v, --version display version info\n\
-w, --new-window spawn program under test in a new window\n\
\n\
MASK can be any combination of the following mnemonics and/or hex values\n\
(0x is optional). Combine masks with '+' or ',' like so:\n\
\n\
--mask=wm+system,malloc+0x00800\n\
\n\
Mnemonic Hex Corresponding Def Description\n\
=========================================================================\n\
all 0x00001 (_STRACE_ALL) All strace messages.\n\
flush 0x00002 (_STRACE_FLUSH) Flush output buffer after each message.\n\
inherit 0x00004 (_STRACE_INHERIT) Children inherit mask from parent.\n\
uhoh 0x00008 (_STRACE_UHOH) Unusual or weird phenomenon.\n\
syscall 0x00010 (_STRACE_SYSCALL) System calls.\n\
startup 0x00020 (_STRACE_STARTUP) argc/envp printout at startup.\n\
debug 0x00040 (_STRACE_DEBUG) Info to help debugging. \n\
paranoid 0x00080 (_STRACE_PARANOID) Paranoid info.\n\
termios 0x00100 (_STRACE_TERMIOS) Info for debugging termios stuff.\n\
select 0x00200 (_STRACE_SELECT) Info on ugly select internals.\n\
wm 0x00400 (_STRACE_WM) Trace Windows msgs (enable _strace_wm).\n\
sigp 0x00800 (_STRACE_SIGP) Trace signal and process handling.\n\
minimal 0x01000 (_STRACE_MINIMAL) Very minimal strace output.\n\
exitdump 0x04000 (_STRACE_EXITDUMP) Dump strace cache on exit.\n\
system 0x08000 (_STRACE_SYSTEM) Serious error which goes to console and log.\n\
nomutex 0x10000 (_STRACE_NOMUTEX) Don't use mutex for synchronization.\n\
malloc 0x20000 (_STRACE_MALLOC) Trace malloc calls.\n\
thread 0x40000 (_STRACE_THREAD) Thread-locking calls.\n\
");
}
static void
version ()
{
fputs (version_string + 4, stderr);
}
struct option longopts[] = {
{"buffer-size", required_argument, NULL, 'b'},
{"help", no_argument, NULL, 'h'},
{"flush-period", required_argument, NULL, 'S'},
{"mask", required_argument, NULL, 'm'},
{"new-window", no_argument, NULL, 'w'},
{"output", required_argument, NULL, 'o'},
{"no-delta", no_argument, NULL, 'd'},
{"pid", required_argument, NULL, 'p'},
{"timestamp", no_argument, NULL, 't'},
{"trace-children", no_argument, NULL, 'f'},
{"translate-error-numbers", no_argument, NULL, 'n'},
{"usecs", no_argument, NULL, 'u'},
{"version", no_argument, NULL, 'v'},
{NULL, 0, NULL, 0}
};
static const char *const opts = "b:dhfm:no:p:S:tuvw";
int
main (int argc, char **argv)
{
unsigned mask = 0;
FILE *ofile = NULL;
pid_t attach_pid = 0;
int opt;
if (!(pgm = strrchr (*argv, '\\')) && !(pgm = strrchr (*argv, '/')))
pgm = *argv;
else
pgm++;
while ((opt = getopt_long (argc, argv, opts, longopts, NULL)) != EOF)
switch (opt)
{
case 'b':
bufsize = atoi (optarg);
break;
case 'd':
delta ^= 1;
break;
case 'f':
forkdebug ^= 1;
break;
case 'h':
// Print help and exit
usage ();
return 1;
break;
case 'm':
{
char *endptr;
mask = parse_mask (optarg, &endptr);
if (*endptr != '\0')
{
// Bad mask expression.
error (0, "syntax error in mask expression \"%s\" near \
character #%d.\n", optarg, (int) (endptr - optarg), endptr);
}
break;
}
case 'n':
numerror ^= 1;
break;
case 'o':
if ((ofile = fopen (optarg, "w")) == NULL)
error (1, "can't open %s", optarg);
#ifdef F_SETFD
(void) fcntl (fileno (ofile), F_SETFD, 0);
#endif
break;
case 'p':
attach_pid = strtol (optarg, NULL, 10);
break;
case 'S':
flush_period = strtol (optarg, NULL, 10);
break;
case 't':
hhmmss ^= 1;
break;
case 'u':
// FIXME: currently unimplemented
usecs ^= 1;
break;
case 'v':
// Print version info and exit
version ();
return 1;
break;
case 'w':
new_window ^= 1;
break;
}
if (!mask)
mask = 1;
if (bufsize)
setvbuf (ofile, (char *) alloca (bufsize), _IOFBF, bufsize);
if (!ofile)
ofile = stdout;
dostrace (mask, ofile, attach_pid, argv + optind);
}
#undef CloseHandle
static BOOL
close_handle (HANDLE h, DWORD ok)
{
child_list *c;
for (c = &children; (c = c->next) != NULL;)
if (c->hproc == h && c->id != ok)
error (0, "Closing child handle %p", h);
return CloseHandle (h);
}
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